A field experiment on the control of weeds in hybrid maize was conducted at the Research Farm of Punjab Agricultural University, Hissar during 1966-67 and 1967-68. The soil was sandy loam and the total rainfall during tha kJza'if season was less than 50 ern, The residual effect of treatments was studied on the rabi crop of wheat in 1967-68. Pre-emergence application of simazine or atrazine @ 1 kg a. i.!ha was found most effective in controlling broadleat and grassy weeds in the maize crop. These treatments gave maximum yield of maize and consequently proved to be most remunerative. The treatment of hand weeding came next to these treatments. The following crop of wheat did not suffer in its yield from simazine or atrazine application made to maize. Pre-emergence treatments of simazine and atrazine @ 1 kg a. i. I ha also increased the nitrogen uptake of the crop plant. Simazine application @ 2 kg a. L/ha proved toxic to the maize crop and reduced the yield.